EP2469989A1 - Herstellungsverfahren für einen supraleitenden beschleunigungsraum - Google Patents

Herstellungsverfahren für einen supraleitenden beschleunigungsraum Download PDF

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Publication number
EP2469989A1
EP2469989A1 EP10809898A EP10809898A EP2469989A1 EP 2469989 A1 EP2469989 A1 EP 2469989A1 EP 10809898 A EP10809898 A EP 10809898A EP 10809898 A EP10809898 A EP 10809898A EP 2469989 A1 EP2469989 A1 EP 2469989A1
Authority
EP
European Patent Office
Prior art keywords
accelerating cavity
superconducting accelerating
welding
superconducting
vacuum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP10809898A
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English (en)
French (fr)
Other versions
EP2469989A4 (de
EP2469989B1 (de
Inventor
Katsuya Sennyu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Machinery Systems Co Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
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Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Publication of EP2469989A1 publication Critical patent/EP2469989A1/de
Publication of EP2469989A4 publication Critical patent/EP2469989A4/de
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Publication of EP2469989B1 publication Critical patent/EP2469989B1/de
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
    • H05H7/14—Vacuum chambers
    • H05H7/18—Cavities; Resonators
    • H05H7/20—Cavities; Resonators with superconductive walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
    • B23K26/1224—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/206—Laser sealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam welding
    • B23K26/28—Seam welding of curved planar seams

Definitions

  • the present invention relates to a superconducting accelerating cavity production method.
  • a superconducting accelerating cavity is formed by joining a plurality of components that are axially arranged.
  • joining has been performed by electron-beam welding in a vacuum atmosphere, in which contamination with impurities is less likely to occur.
  • the disclosure of PTL 1 proposes that joining of a superconducting accelerating cavity be performed in an argon atmosphere from the inside by laser welding.
  • the present invention has been made in view of such circumstances, and an object thereof is to provide a superconducting accelerating cavity production method with which a high-quality superconducting accelerating cavity can be produced with a compact device configuration and at low cost.
  • a superconducting accelerating cavity production method is a method, in which a superconducting accelerating cavity is produced by arranging, in an axial direction, a plurality of ring-like members having openings at both ends in the axial direction and joining the openings to one another by welding.
  • the ring-like members are joined by welding with a laser beam from the inside of the superconducting accelerating cavity, in which a vacuum atmosphere is created.
  • the ring-like members constituting the superconducting accelerating cavity are joined by welding with a laser beam from the inside of the superconducting accelerating cavity, in which a vacuum atmosphere is created.
  • the welding means is provided inside the superconducting accelerating cavity, the area in which a vacuum atmosphere is created is limited to a small area covering the superconducting accelerating cavity.
  • the vacuum atmosphere can be created in a short time. Because this enables a reduction in the working time, the labor costs can be reduced.
  • the welding can be performed in a high vacuum.
  • a high-quality superconducting accelerating cavity can be produced.
  • the inside of the superconducting accelerating cavity be evacuated to create a vacuum atmosphere.
  • a foreign substance, such as gas, generated during welding with a laser beam can be directly and constantly sucked and discharged.
  • a foreign substance, such as gas can be prevented from depositing on the inner surface of the superconducting accelerating cavity, and thus, a high-quality superconducting accelerating cavity can be produced.
  • non-penetration welding be performed from the outside prior to welding with the laser beam from the inside of the superconducting accelerating cavity.
  • the superconducting accelerating cavity itself can be used as a vacuum chamber. Because a vacuum atmosphere can be created by evacuating the inner space of the superconducting accelerating cavity, a high vacuum can be easily realized. By doing so, laser welding can be performed in a high vacuum, and thus, a high-quality superconducting accelerating cavity can be produced.
  • the welding means is provided inside the superconducting accelerating cavity, the system can be constructed at low cost, with a compact device configuration. Furthermore, because the area in which a vacuum atmosphere is created is small, the working time can be reduced, and the labor costs can be reduced. In addition, because a high vacuum is easily realized, a high-quality superconducting accelerating cavity can be produced.
  • FIG. 1 shows the schematic configuration of a welding device that implements a superconducting accelerating cavity production method according to an embodiment of the present invention.
  • FIG. 2 is a partial sectional view, showing a step in the superconducting accelerating cavity production method according to this embodiment.
  • FIG. 3 is a partial sectional view, showing another step in the superconducting accelerating cavity production method according to this embodiment.
  • a superconducting accelerating cavity 1 is a structure formed of, for example, five cylindrical cells 3 bulging in the middle.
  • half-cells (ring-like members) 5 are formed by bending and press-molding, for example, a niobium material, which is a superconducting material, the half-cells 5 each constituting one of two segments of each cell 3 bisectioned in the axial direction.
  • the half-cell 5 extends between an equatorial portion 9 where the cell 3 bulges most, in the axial direction L, and an iris portion 11 where the cell 3 is recessed most.
  • Each half-cell 5 is a ring-like member having openings at both ends, i.e., portions corresponding to the equatorial portion 9 and the iris portion 11.
  • the plurality of half-cells 5 are arranged in the axial direction L such that the equatorial portions 9 overlap each other and such that the iris portions 11 overlap each other, and the contact portions are joined, thus forming the superconducting accelerating cavity 1.
  • the ring-like member is not limited to the half-cell 5; the cell 3, the two half-cells 5 integrated at the iris portion 11, or other various configurations may be used.
  • the welding device 7 includes a holding member 13 for securing the superconducting accelerating cavity 1 to prevent deformation thereof, vacuum suction members 15 and 17 that evacuate the inside of the superconducting accelerating cavity 1, and a laser output device 19 disposed in the superconducting accelerating cavity 1.
  • the holding member 13 includes a pair of holding plates 21 that securely hold both ends of the superconducting accelerating cavity 1, and a plurality of securing shafts 23 that connect the pair of holding plates 21 and maintain the distance therebetween.
  • the securing shafts 23 are made of a material whose coefficient of linear expansion is close to that of the material of the superconducting accelerating cavity 1. For example, if the superconducting accelerating cavity 1 is made of niobium, the securing shafts 23 are made of a niobium-zirconium alloy, titanium, or the like.
  • the vacuum suction members 15 and 17 respectively include vacuum pumps 25 and 27, suction pipes 29 and 31 through which the vacuum pumps 25 and 27 communicate with the inside of the superconducting accelerating cavity 1, and on-off valves 33 and 35 that open/close the suction pipes 29 and 31.
  • the suction pipe 29 is connected to a flange portion at one end of the superconducting accelerating cavity 1, and the suction pipe 31 is connected to a flange portion at the other end.
  • the laser output device 19 includes a rotation shaft 37 attached to the suction pipes 29 and 31 so as to pass through the central axis of the superconducting accelerating cavity 1 and so as to be rotatable about the central axis, and a laser output portion 39 accommodating a laser optical system (not shown) for outputting a laser beam.
  • the rotation shaft 37 is rotated about the central axis by a driving device (not shown).
  • the laser output portion 39 is attached to the rotation shaft 37 so as to be moveable in the axial direction L, while being prevented from moving in the rotation direction. Because the laser output portion 39 is disposed in the vacuum atmosphere, a mirror of the laser optical system accommodated therein is cooled.
  • the laser optical system receives light supplied from an external light source (not shown) through, for example, an optical fiber.
  • the superconducting accelerating cavity production method first, a plurality of half-cells 5 are stacked, and non-penetration welding 41 is performed on the equatorial portions 9 and the iris portions 11, which are joints, from the outer peripheral side, as shown in FIG. 2 .
  • the non-penetration welding 41 on the outer peripheral side may be performed either by laser welding under an argon atmosphere, or by other known welding means.
  • the superconducting accelerating cavity 1 is conveyed into the welding device 7, and both ends thereof are securely attached to the holding plates 21.
  • the securing shafts 23 are attached to the holding plates 21 so as to maintain the distance between the holding plates 21.
  • the suction pipes 29 and 31 are attached so as to communicate with the inner space inside the superconducting accelerating cavity 1.
  • the rotation shaft 37 and the laser output portion 39 are attached so as to be positioned at predetermined positions in the inner space inside the superconducting accelerating cavity 1.
  • the vacuum pumps 25 and 27 are activated to evacuate the inner space inside the superconducting accelerating cavity 1, creating a pressure of about, for example, 1 ⁇ 10 -4 Pa.
  • the superconducting accelerating cavity 1 itself can be used as the vacuum chamber, the need to prepare a separate vacuum chamber is eliminated. By doing so, it becomes possible to simplify the device configuration and perform joining with a compact device configuration, and the system can be constructed at low cost.
  • a vacuum atmosphere for laser welding can be created by evacuating a limited area, i.e., the inner space inside the superconducting accelerating cavity 1, a high vacuum can be easily realized. Because the vacuum atmosphere can be created in a short time in this way, the working time can be reduced, and the labor costs can be reduced.
  • the laser output portion 39 is aligned with a joint.
  • the laser optical system supplies light, i.e., a laser beam, supplied from the light source (not shown) to the joint of the half-cells 5 to perform non-penetration welding 43 on the equatorial portion 9 or the iris portion 11, which is the joint, from the inner peripheral side, as shown in FIG. 1 .
  • the non-penetration welding 43 can be performed on the entire inner peripheral surface of the superconducting accelerating cavity 1.
  • the laser output portion 39 is moved along the rotation shaft 37.
  • the laser output portion 39 is moved to the next joint, and the laser welding is performed in the same manner.
  • the welding operation is completed. Because a small-capacity vacuum atmosphere is created, i.e., only the inner space inside the superconducting accelerating cavity 1, it is easy to create a high vacuum. Because welding can be performed in a high vacuum, a high-quality superconducting accelerating cavity 1 can be produced.
  • the vacuum pumps 25 and 27 perform suction during welding, a foreign substance, such as gas, generated during welding with a laser beam can be directly and constantly sucked and discharged. By doing so, it is possible to prevent a foreign substance, such as gas, from depositing on the inner surface of the accelerating cavity 1. Thus, a high-quality superconducting accelerating cavity 1 can be produced.
  • the superconducting accelerating cavity 1 is conveyed into the welding device 7 after it has been integrated by being subjected to welding on the outer peripheral side, it may be welded by the welding device 7.
  • the stacked half-cells 5 may be held by the holding member 13 and welded from the outer peripheral side.
  • a vacuum atmosphere is created in the superconducting accelerating cavity 1, and welding on the inner peripheral side is performed.
  • a vacuum chamber 45 having a space in which the superconducting accelerating cavity 1 can be accommodated may be provided.
  • the vacuum chamber 45 has a cylindrical shape with the axis extending in the up-down direction, a portion thereof in the height direction constituting a bellows portion 47 that can be expanded and contracted in the up-down direction.
  • the lower end surface of the vacuum chamber 45 has a large opening into which the superconducting accelerating cavity 1 can be inserted. This opening is sealed by an end of the suction pipe 31.
  • a plurality of pairs of brackets 49 are provided at a certain interval in the peripheral direction.
  • Securing shafts 51 are provided.
  • the securing shafts 51 are attached in a removable manner.
  • the bellows portion 47 expands and contracts in response to changes in height of the superconducting accelerating cavity 1 in the up-down direction. When the superconducting accelerating cavity 1 is installed, the securing shafts 51 are attached to limit the expansion and contraction of the bellows portion 47.
  • a vacuum suction member 53 that evacuates the inside of the vacuum chamber 45 is provided.
  • the vacuum suction member 53 includes a vacuum pump 55, a suction pipe 57 through which the vacuum pump 55 communicates with the inside of the vacuum chamber 45, and an on-off valve 59 that opens/closes the suction pipe 57.
  • the stacked half-cells 5 are installed in the vacuum chamber 45. At this time, any variation in height of the superconducting accelerating cavity 1 is absorbed by the expansion and contraction of the bellows portion 47.
  • the suction pipes 29 and 31 are attached so as to communicate with the inner space inside the superconducting accelerating cavity 1 and so as to seal the vacuum chamber 45.
  • the rotation shaft 37 and the laser output portion 39 are attached so as to be positioned at predetermined positions in the inner space inside the accelerating cavity 1.
  • the securing shafts 51 are attached so that the distance between the pairs of brackets 49 does not change.
  • the vacuum pumps 25, 27, and 55 are activated to evacuate the inner spaces inside the superconducting accelerating cavity 1 and vacuum chamber 45, creating a pressure of about 1 ⁇ 10 -4 Pa, for example.
  • the vacuum chamber 45 is barely large enough to cover the circumference of the superconducting accelerating cavity 1, the capacity to be evacuated is limited to a small area. By doing so, joining can be performed with a compact device configuration, and hence, the system can be constructed at low cost.
  • the area in which a vacuum atmosphere is created is small, the vacuum atmosphere can be created in a short time. Because this enables a reduction in the working time, the labor costs can be reduced.
  • the welding can be performed in a high vacuum. Thus, a high-quality superconducting accelerating cavity 1 can be produced.
  • a welding operation by the laser output device 19 is started.
  • penetration welding is performed on the equatorial portions 9 and the iris portions 11, which are the joints, from the inner peripheral side.
  • the penetration welding is performed on the entire inner peripheral surface of the superconducting accelerating cavity 1.
  • a foreign substance, such as gas, generated during welding with a laser beam can be directly and constantly sucked and discharged. By doing so, a foreign substance, such as gas, can be prevented from depositing on the inner surface of the accelerating cavity 1, and thus, a high-quality superconducting accelerating cavity 1 can be produced.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Particle Accelerators (AREA)
  • Laser Beam Processing (AREA)
EP10809898.9A 2009-08-17 2010-08-11 Herstellungsverfahren für einen supraleitenden beschleunigungsraum Not-in-force EP2469989B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009188354A JP5409186B2 (ja) 2009-08-17 2009-08-17 超伝導加速空洞の製造方法
PCT/JP2010/063628 WO2011021553A1 (ja) 2009-08-17 2010-08-11 超伝導加速空洞の製造方法

Publications (3)

Publication Number Publication Date
EP2469989A1 true EP2469989A1 (de) 2012-06-27
EP2469989A4 EP2469989A4 (de) 2014-12-17
EP2469989B1 EP2469989B1 (de) 2016-07-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP10809898.9A Not-in-force EP2469989B1 (de) 2009-08-17 2010-08-11 Herstellungsverfahren für einen supraleitenden beschleunigungsraum

Country Status (5)

Country Link
US (1) US8883690B2 (de)
EP (1) EP2469989B1 (de)
JP (1) JP5409186B2 (de)
CA (1) CA2766382C (de)
WO (1) WO2011021553A1 (de)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5449019B2 (ja) * 2010-05-12 2014-03-19 三菱重工業株式会社 超伝導加速空洞および超伝導加速空洞の製造方法
JP5781278B2 (ja) 2010-05-14 2015-09-16 三菱重工業株式会社 溶接装置
US9756715B2 (en) * 2013-12-11 2017-09-05 Jefferson Science Associates, Llc Flange joint system for SRF cavities utilizing high force spring clamps for low particle generation
GB2528863B (en) * 2014-07-31 2016-07-13 Elekta ltd Radiotherapy systems and methods
JP5985011B1 (ja) * 2015-06-30 2016-09-06 三菱重工メカトロシステムズ株式会社 超伝導加速器
DE102015212930B4 (de) 2015-07-10 2019-05-23 Heraeus Deutschland GmbH & Co. KG Verfahren zur Herstellung supraleitender Dichtungsringe
US11202362B1 (en) 2018-02-15 2021-12-14 Christopher Mark Rey Superconducting resonant frequency cavities, related components, and fabrication methods thereof
US10856402B2 (en) * 2018-05-18 2020-12-01 Ii-Vi Delaware, Inc. Superconducting resonating cavity with laser welded seam and method of formation thereof
JP2020187871A (ja) * 2019-05-10 2020-11-19 三菱重工機械システム株式会社 超伝導加速空洞の内面処理方法、超伝導加速空洞の製造方法、及び、超伝導材料の表面処理方法
JP2024021159A (ja) * 2022-08-03 2024-02-16 三菱重工機械システム株式会社 加速空洞

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0483964A2 (de) * 1990-10-31 1992-05-06 The Furukawa Electric Co., Ltd. Supraleitendes Beschleunigungsrohr und Verfahren zur Herstellung
JP2000260599A (ja) * 1999-03-09 2000-09-22 Toshiba Corp 超電導キャビティ、その製造方法、及び超電導加速器
EP1871150A1 (de) * 2005-04-12 2007-12-26 Mitsubishi Heavy Industries, Ltd. Verfahren zur herstellung eines supraleiter-beschleunigungsraumes

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04218300A (ja) * 1990-10-31 1992-08-07 Furukawa Electric Co Ltd:The 超電導加速管及びその製造方法
JPH04322100A (ja) * 1991-04-19 1992-11-12 Furukawa Electric Co Ltd:The 加速管の製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0483964A2 (de) * 1990-10-31 1992-05-06 The Furukawa Electric Co., Ltd. Supraleitendes Beschleunigungsrohr und Verfahren zur Herstellung
JP2000260599A (ja) * 1999-03-09 2000-09-22 Toshiba Corp 超電導キャビティ、その製造方法、及び超電導加速器
EP1871150A1 (de) * 2005-04-12 2007-12-26 Mitsubishi Heavy Industries, Ltd. Verfahren zur herstellung eines supraleiter-beschleunigungsraumes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2011021553A1 *

Also Published As

Publication number Publication date
EP2469989A4 (de) 2014-12-17
JP2011040321A (ja) 2011-02-24
CA2766382A1 (en) 2011-02-24
US20120100994A1 (en) 2012-04-26
CA2766382C (en) 2015-07-07
EP2469989B1 (de) 2016-07-06
JP5409186B2 (ja) 2014-02-05
WO2011021553A1 (ja) 2011-02-24
US8883690B2 (en) 2014-11-11

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